When i send a github link we don't have preview.

[GuillaumeLoyer]

Describe the bug
When sharing a GitHub link in Slack, the link preview is not displayed. According to the documentation (GitHub Slack Integration), this feature should work. All other integration features are functioning correctly, but when I send a message such as:

Check out the repo https://github.com/ExempleGLO/NomduRepo
No preview is displayed for the link.

To Reproduce
Steps to reproduce the behavior:

1. Integrate the GitHub app with Slack as per the instructions in the documentation.
2. Open a Slack channel where the GitHub app is active.
3. Post a message containing a GitHub link, such as https://github.com/ExempleGLO/NomduRepo.
4. Observe that no link preview is displayed.

Expected behavior
When a GitHub link is shared in Slack, a preview should be displayed with relevant information about the repository, as described in the documentation.

Screenshots

Desktop (please complete the following information):

• OS: Microsoft Windows [version 10.0.26100.2605]
• Slack application
• Version : Windows Store 4.41.98 64-bit

Additional context

• The GitHub app is correctly integrated into Slack.
• Other features, such as subscribing to repository updates, work perfectly, and previews are displayed for those events as expected (e.g., repository activity notifications).
• The "link previews" setting is enabled in Slack, and we can see previews for other types of links.
• However, when sending a GitHub link in a message, no preview is displayed.
• We are in a Slack organization with the Pro level of licenses.